Method of making mixed yarns



Patented Feb. 20, 1951 METHOD OF MAKING MIXED YARNS Robert Heme de Lacotte, Paris, France, assignor to Comptoir des Textiles Artificiels, Paris,

France, a corporation of France No Drawing. Application June 2, 1947, Serial No. 751,953. In France June 6, 1945 Section 1, Public Law 690; August 8; 1946' Patent expires June:6, 1965f 4 Claims. 1

ThlSzll'lVBIltlOIl relatesto dyed mixed yarns and the method of making the same. More particularly, it relates to mixed yarns dyed in a uniform shade and the method of making the same, as

well as to fabricsiormed of such yarns.

One of the known methods of preparing dyed artificial yarns consists in incorporating in the spinning solution the desired colored pigment,

dye, or substance which is capable of being converted into a dye as a result of appropriate treatments of theyarns obtained fromv such solution.

.Blends' of. natural fibers and artificial fibers have been converted" into yarns. Blends containingiartificial 'fibersdyed' by contrast have also been utilized, but; in order to obtain chine An object of this invention is to provide a new and improved method of preparing dyed mixed yarns.

Another object of this invention is to provide a method for the manufacture of dyed mixed yarns exhibiting a uniform shade without over-dyeing.

An additional object is to provide dyed mixed yarns of uniform shade.

Other and additional objects will become apparent hereinafter.

The objects of this invention are accomplished, in general, by spinning yarn from a homogeneous blend of natural fibers, such as undyed cotton fibers, and artificial fine fibers dyed throughout the mass thereof. The homogeneous blend is obtained by repeated beating and carding of the mass of fibers.

Experience has shown that a homogeneous blend of fibers is essential for the production of yarn which, after fabrication into a fabric, will have a uniform shade. In order to produce such a blend, the mass of fibers is passed four times through a beater and twice through a card.

The details and manner of practicing the invention will become apparent by reference to the following specific examples, it being understood that these examples are merely illustrative embodiments. of the invention and that the scope of the invention is not limited thereto. Throughout the examples, the proportions of the ingredirents are parts by Weight.

effects, the two shadesmustbe visible side-by- Example I Staple fibers of 1.25 denier and 28 mm. long were prepared from a viscose solution containing 9% cellulose, 6% caustic soda, and 2% of Indanthrene Brown in the known process. The required amount ofthe dyed artificial fibers'was mixed with Sakel cotton to form a homogeneousblend in Which the dyed artificial fibers were present in an amount of 20%. The blend was obtained by passing'the staple rayon fibers and the cotton four times through a beater and twice through a card. The blend of mixed fibers was spun into yarn by a known procedure; and the threads were characterizedby a chatoyantmaro'onpastel shade and were very attractive.

Erample II" Staple fibers of l denier and 28 mm. longwere prepared in the usual manner from a viscose solution containing 9% cellulose, 6% caustic soda, and 0.5% of B. S. Monastrel Blue. A mass containing 25% of such staple fibers and 75% Sakel cotton was subjected to four beatings and two carding operations, whereby a homogeneous blend was obtained. The blend was spun into yarn, and the yarn woven into fabric. The cloth was characterized by a light blue color and was highly attractive. The attractiveness was further enhanced by bleaching.

As is shown by the examples, the dyed artificial fibers are preferably obtained by the incorporation of an appropriate dye into the spinning solution from which such staple fibers are prepared, whereby each artificial fiber is dyed throughout the mass thereof. It is to be underderstood that the invention is not restricted to the specific dyes of the examples.

In general, any pigment, dye or substance capable of being converted into a dye by a subsequent treatment, which is not deleteriously affected by the spinning solution or other solutions encountered during the production of the fibers, can be used, it being understood that the dye, or the dye which is formed in situ, is capable of dyeing the substance constituting the mass of the fiber.

The proportions of the constituents of the blend can vary within rather large limits. The blend can contain from 5% to of the dyed artificial fibers. Particularly satisfactory results have been obtained with blends containing from 10% to 20% of the dyed artificial fibers.

The quantity of dye employed for producing the dyed artificial fibers can also vary. In gen- .eral, the quantity of dye can be from 0 .5% to 3 5% of the fiber. In the preferred embodiment, when the dyed artificial fibers are present in an amount of from to of the blend, the dye is present in an amount not exceeding 2.5% by weight of the dyed fibers.

The denier of the dyed staple fibers is important. In order to obtain a satisfactory uniform shade, the fineness of the artificial fibers should not be higher than approximately 2 denier and preferably lower than 1 denier.

As previously mentioned, it is essential that the blend of mixed fibers be homogeneous. As shown by the examples, the necessary homogeneity of the blend can be obtained when the mass of both of the fibers is passed four times through the beater and twice through the carding device.

Though cotton is the preferred natural fiber,

nevertheless other natural fibers in the undyed state, such as flax, wool, etc., can be used.

. Likewise, though viscose rayon staple is the preferred artificial fiber, nevertheless fibers of the size herein described of other artificial fibers, such as those formed from cuprammonium cellulose, cellulose ether, cellulose acetate, etc., can beused.

The invention provides a method wherein a relatively small amount of dye is utilized, since only the artificial (staple) fibers are dyed, and the natural fibers remain in their original condition and do not consume any dyestuff in the interior thereof. Since it is obvious that many changes and modifications can be made in the above-described details without departing from the nature and spirit of the invention, it is to be understood that the invention is not to be limited thereto except asset forth in the appended claims.

I claim:

1. A method of preparing dyed mixed yarns which comprises subjecting a mixture'of staple fibers of regenerated cellulose which are of a denier not greater than 1 and are dyed throughout the mass thereof, and a plurality of cotton fibers to a plurality of beating operations, subjecting the beaten mass to a plurality of carding operations, and thereafter spinning the blend of fibers into yarn.

2. A method of preparing dyed mixed yarns as set forth in claim 1 in which the staple fibers comprise from 5% to of the mixture.

3. A method of preparing dyed mixed yarns as set forth in claim 1 in which the staple fibers comprise from 10% to 20% of the mixture.

4. A method of preparing dyed mixed yarns as set forth in claim 1 in which the regenerated cellulose staple fibers are prepared from a solution containing from .5% to 5% by weight of a dye.

ROBERT HEME 1m LACOTTE;

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Dreyfus Jan. 27, 1942 

1. A METHOD OF PREPARING DYED MIXED YARNS WHICH COMPRISES SUBJECTING A MIXTURE OF STAPLE FIBERS OF REGENERATED CELLULOSE WHICH ARE OF A DENIER NOT GREATER THAN 1 AND ARE DYED THROUGHOUT THE MASS THEREOF, AND A PLURALITY OF COTTON FIBERS TO A PLURALITY OF BEATING OPERATIONS, SUBJECTING THE BEATEN MASS TO A PLURALITY OF CARDING OPRATIONS, AND THEREAFTER SPINNING THE BLEND OF FIBERS INTO YARN. 